neyins



(No Model.)

'I'. F. NEVINS. SECONDARY BATTERY.

No. 427,789. Patented May 13, 1890.

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UNITED STATES PATENT OFFICE.

THOMAS F. NEVINS, OF BROOKLYN, NET YORK, ASSIGNOR OF ONE-HALF TO J OIIN IV. CARTER AND HARRY CAREY, BOTH OF SAME PLACE.

SECON DARY BATTERY.

SPECIFICATION forming part of Letters Patent No. 427,789, dated May 13, 1890.

Application filed December 8, 1888. Renewed April 9, 1890. Serial No. 347,184. (No model.)

To all whom it may concern:

Be it known that I, THOMAS F. NEVINS, of Brooklyn, in the county of Kings and State of New York, a citizen of the United States,

have invented certain new and useful Improvements in Secondary Batteries, of which the following is a specification.

The object of my invention is to provide a new and improved secondary battery, which 1o is simple in construction, compact, and durable.

The invention consists in the construction and combination of parts and details, as will be fully described hereinafter, and iinally be pointed out in the claims.

In the accompanying` drawings, Figure l is a top view of my improved secondary battery. Fig. 2 is a vertical transverse sectional view of the same on line a a, Fig. l. Fig. 3

zo is a detail view of the upper end of one electrode, parts being in section. Fig. 4 is a crosssection of Fig. 3.

Similar letters of reference indicate corresponding parts.

The electrodes or plates A are suspended from the cover B, resting on the top of the jar C, said cover being made of ebonite or other suitable insulatingmaterial. The electrodes are composed of an alloy of lead and 3o tin, containing` not more than thirty parts of tin. The electrodes or plates have two vertical rows of apertures D, the edges of which are beveled inward from both faces of the electrode, so as to form pockets for receiving 3 5 the filling E of the oxide of lead. Additional apertures F are provided between the apertures D to permit of a thorough circulation of the excitingdiquid. Each electrode is provided at its upper end with a projection G,

the top of which forms the shoulders G',

which can rest against the rubber packingplate H on the under side of the cover B.

From the projection Ga threaded stem J projects upward, and the same contains a threaded core K, of iron, for the purpose of rendering the stem J more durable. Said stems are passed through apertures in the plate B and through apertures in the lugs of two rings M and N on the upper surface of the cover. The lugs of the rings M and N 5o alternate, as shown, so that the plates or electrodes are alternately held iu the lugs of the rings M and N. The ring M is to be connected with the positive wire and the ring N with the negative. Nuts O are screwed on those ends of the stems J proj ect-ing above the rings. By drawing" said nuts tight the electrodes are held in place and the rings M and N clamped firmly on the top of the cover B.`

A nut on one lug of the ring M and another 6o nut on one lug of the ring N are provided with a projection P, having an aperture P', through which the conducting-wire can be passed, a binding-screw Q being screwed into the said extensions P, so that the nut serves 6 5 as a combined nut and binding-post.

A vent-tube R projects through the top of the cover to permit the escape of gases. A screw-ring S is screwed on the jar C, and its iiange, pressing on the cover B, presses the 7o rubber packing-plate II on the top edge of the jar, thus forming aclose and tight joint. The electrodes are arranged radially, as shown in Fig. l.

This battery is very simple in construction, 7 5 the electrodes can easily be removed, and any one electrode that has become destroyed can easily be replaced by another. The oxide of lead is held securely in beveled apertures, and the electrodes, composed of an alloy of lead 8o and tin, are very durable and do not become disintegrated or granulated by the action of the excitingdiquid.

Having thus described my invention, I claim as new and desire to secure by Letters 8 5 Patentl. In a secondary battery, an electrode having a series of apertures, the edges of which are beveled inward from both faces of the electrode, and a series of apertures between 9o said beveled apertures, substantially as set forth.

2. In asecondary battery, an electrode having a screw-threaded stem on its upper end made integral with said electrode, and a 9 5 threaded iron core in said stem, substantially as set forth.

3. In a secondary battery, the combination,

lWith a jar and cover, of two rings on the top In testimony that I claim the foregoing as of the cover, which rin gs have apertured lugs, my invention I have signed my name in preseleotrodes provided With screw threaded ence of two subscribing Witnesses. stems passed through apertures in the @over THOS. F. NEVINS.

5 and through the apertures in the lugs, and Witnesses:

nuts screwed on the upper end of said stems, OSCAR F. GUNZ, substantially as set forth. J oHN A. STRALEY. 

